/Engine/Source/Runtime/Engine/Classes/Materials/MaterialInterface.h
Return insight on what (e.g. texture coordinates, vertex data, etc) is used in the shader graph of a material custom output
void AnalyzeMaterialCustomOutput ( [UMaterialExpressionCustomOutput](API\Runtime\Engine\Materials\UMaterialExpressionCustomOutput) * InCustomOutput, int32 InOutputIndex, [FMaterialAnalysisResult](API\Runtime\Engine\Materials\FMaterialAnalysisResult) & OutResult )